I have for that past month been getting the kernel error "TCP: Treason uncloaked!" message. I have googled "kernel: TCP: Treason uncloaked!" and you can find plenty of information regarding this topic however the information out there points in all different directions. There is nothing that I can see per my logs or firewall that would point to an attack of any sort so I am siding w/ the information I see on the net possibly with the kernel version and or conflict with SME.
Here is my build: SME Server 8.0 with "all" of the important security updates as of 12/17/2013
Kernel version: 2.6.18-371.3.1.el5PAE
logfile: /var/log/messages/
Dec 17 11:26:29 mail kernel: TCP: Treason uncloaked! Peer 207.46.163.247:25/49245 shrinks window 3531356396:3531357706. Repaired.
Dec 17 11:47:34 mail kernel: TCP: Treason uncloaked! Peer 207.46.163.170:25/54824 shrinks window 2102177650:2102180270. Repaired.
Dec 17 11:47:34 mail kernel: TCP: Treason uncloaked! Peer 207.46.163.247:25/49372 shrinks window 1000342492:1000345112. Repaired.
Dec 17 11:47:35 mail kernel: TCP: Treason uncloaked! Peer 207.46.163.170:25/54824 shrinks window 2102177650:2102180270. Repaired.
Dec 17 11:47:35 mail kernel: TCP: Treason uncloaked! Peer 207.46.163.247:25/49372 shrinks window 1000342492:1000345112. Repaired.
Dec 17 12:08:03 mail kernel: TCP: Treason uncloaked! Peer 207.46.163.215:25/45964 shrinks window 2198891982:2198894602. Repaired.
Dec 17 12:08:03 mail kernel: TCP: Treason uncloaked! Peer 207.46.163.215:25/45964 shrinks window 2198891982:2198894602. Repaired.
Dec 17 12:13:33 mail kernel: TCP: Treason uncloaked! Peer 208.65.145.2:25/38244 shrinks window 2392449592:2392453267. Repaired.
Dec 17 12:13:35 mail last message repeated 2 times
Dec 17 12:15:01 mail kernel: TCP: Treason uncloaked! Peer 208.65.144.2:25/33709 shrinks window 1011027886:1011031816. Repaired.
Dec 17 12:15:09 mail last message repeated 4 times
Dec 17 12:26:46 mail kernel: TCP: Treason uncloaked! Peer 207.109.236.95:25/33026 shrinks window 870052634:870056324. Repaired.
Dec 17 12:26:49 mail last message repeated 3 times
Dec 17 12:39:11 mail kernel: TCP: Treason uncloaked! Peer 174.46.102.103:25/34263 shrinks window 777887076:777889536. Repaired.
Dec 17 12:39:12 mail kernel: TCP: Treason uncloaked! Peer 174.46.102.103:25/34264 shrinks window 899630582:899633042. Repaired.
Dec 17 12:39:12 mail kernel: TCP: Treason uncloaked! Peer 174.46.102.103:25/34264 shrinks window 899630582:899633042. Repaired.
Dec 17 12:40:14 mail kernel: TCP: Treason uncloaked! Peer 216.234.108.234:25/35908 shrinks window 665604226:665608132. Repaired.
Any help regarding this matter is appreciated